As Windows 8 is a touch screen oriented OS , So Microsoft has integrated the lock screen feature to prevent accidental touches which can cause trouble.
But if you find it troublesome , you can deactivate is easily.
To deactivate the lock screen, first in the Start screen type “regedit” and press [Enter] .
Confirm the User Account control dialogue box by clicking “Yes”.
Now Navigate to key
“HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Personalization”. If the key “Personalization” doesn’t exist , then create it with the command ” EDIT | New | Key” .
Ones done click on the right-hand side panel and open the option ” Edit | New | DWORD ( 32-bit) Value “.
Name the new value “NoLockScreen” and press [Enter] . Double click the new entry and change its “Value” to “1″ and confirm the changes by clicking “OK”.
Now you have deactivated the lock screen.